[PATCH v3 16/35] mempool: add function to iterate the memory chunks

[Olivier Matz <olivier.matz@6wind.com>]

In the same model than rte_mempool_obj_iter(), introduce
rte_mempool_mem_iter() to iterate the memory chunks attached
to the mempool.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 lib/librte_mempool/rte_mempool.c           | 16 ++++++++++++++++
 lib/librte_mempool/rte_mempool.h           | 27 +++++++++++++++++++++++++++
 lib/librte_mempool/rte_mempool_version.map |  1 +
 3 files changed, 44 insertions(+)

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 9260318..cbf5f2b 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -246,6 +246,22 @@ rte_mempool_obj_iter(struct rte_mempool *mp,
 	return n;
 }
 
+/* call mem_cb() for each mempool memory chunk */
+uint32_t
+rte_mempool_mem_iter(struct rte_mempool *mp,
+	rte_mempool_mem_cb_t *mem_cb, void *mem_cb_arg)
+{
+	struct rte_mempool_memhdr *hdr;
+	unsigned n = 0;
+
+	STAILQ_FOREACH(hdr, &mp->mem_list, next) {
+		mem_cb(mp, mem_cb_arg, hdr, n);
+		n++;
+	}
+
+	return n;
+}
+
 /* get the header, trailer and total size of a mempool element. */
 uint32_t
 rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index 690928e..65455d1 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -336,6 +336,15 @@ typedef void (rte_mempool_obj_cb_t)(struct rte_mempool *mp,
 typedef rte_mempool_obj_cb_t rte_mempool_obj_ctor_t; /* compat */
 
 /**
+ * A memory callback function for mempool.
+ *
+ * Used by rte_mempool_mem_iter().
+ */
+typedef void (rte_mempool_mem_cb_t)(struct rte_mempool *mp,
+		void *opaque, struct rte_mempool_memhdr *memhdr,
+		unsigned mem_idx);
+
+/**
  * A mempool constructor callback function.
  *
  * Arguments are the mempool and the opaque pointer given by the user in
@@ -606,6 +615,24 @@ uint32_t rte_mempool_obj_iter(struct rte_mempool *mp,
 	rte_mempool_obj_cb_t *obj_cb, void *obj_cb_arg);
 
 /**
+ * Call a function for each mempool memory chunk
+ *
+ * Iterate across all memory chunks attached to a rte_mempool and call
+ * the callback function on it.
+ *
+ * @param mp
+ *   A pointer to an initialized mempool.
+ * @param mem_cb
+ *   A function pointer that is called for each memory chunk.
+ * @param mem_cb_arg
+ *   An opaque pointer passed to the callback function.
+ * @return
+ *   Number of memory chunks iterated.
+ */
+uint32_t rte_mempool_mem_iter(struct rte_mempool *mp,
+	rte_mempool_mem_cb_t *mem_cb, void *mem_cb_arg);
+
+/**
  * Dump the status of the mempool to the console.
  *
  * @param f
diff --git a/lib/librte_mempool/rte_mempool_version.map b/lib/librte_mempool/rte_mempool_version.map
index 72bc967..7de9f8c 100644
--- a/lib/librte_mempool/rte_mempool_version.map
+++ b/lib/librte_mempool/rte_mempool_version.map
@@ -22,6 +22,7 @@ DPDK_16.07 {
 
 	rte_mempool_check_cookies;
 	rte_mempool_obj_iter;
+	rte_mempool_mem_iter;
 
 	local: *;
 } DPDK_2.0;
-- 
2.8.0.rc3